Hydraulic jacking system for vehicles



Feb. 22, 1938. D. w. SESSIONS I v 2,109,238

HYDRAULIC JACKING SYSTEM FOR VEHICLES Filed Nov. 19, 1955 Sheets-Sheet 1 I A 14 a I I INVENTORq .DONALD WILF RED EION5 BY w ATTORNEYS Feb. 22, 1938. n w SESSIONS 2,109,238

HYDRAULIC JACKING .SYSTEM FOR VEHICLES I Filed Nov. 19, 1935 2 Sheets- Sheet 2 'IIIIIIIA INVENTOR= I DONALD WILFRED 6E-5ION ATTORNEYS UNITED STATES PATENT OFFICE HYDRAULIC JACKING' SYSTEM FOR VEHICLES Donald Wilfred Sessions, wiile'sden, London,

. l Enxland Application November 19,1935, Serial No. 50,530 In Great Britain October 16, 1935 8 Claims. (CI. 60-52) I This invention relates to hydraulic jacking sysnected at its rear end to a tube E which tube terns for vehicles and its main object is to provide contains a push and pull cable E The socket means for warning the driver when the jacks. are is internally screw-threaded to receive a threadin operation and a further object is to minimize ed member E which can move axially but is 5 the possibility of thewarning device remaining held gainst ro ation by a square head E". This 5 in action when the vehicle is not in use. movable member is connected to the push and In order that the invention may be clearly pull cable E The two armed lever D is pivotunderstood and readily carried into effect the ally mou in a Small housing On the same will now be described more fully with referrel- E and one arm of this lever'extends through enee t0 the accompanying drawings in which:--- a slot or slots into the path of the square head E". 10

Figure 1 is a diagrammatic illustration of a The other end of the cable E is connected to motor-car having applied thereto a jacking means for controlling the driving and pp system made in accordance with the invention; of a pump F which supplies fluid pressure to the Figure 2 is a sectional view of. that part of the lifting l cks and a o i c nne ted to a valve l6 jacking system control device which is adjacent -for releasing the fluid pressure supplied tothe to the dashboard ofthe' vehicle and illustrates a. l The p p F is mounted 0!! the vehicle n warning device made in accordance with the ina suitable position according to the part from vention; which it is to be driven. In Figure l the pump Figure 3 is a sectional view on the line 3-8 of .iS hown attached to e y mo G o which it Figure 2; can be coupled. The pump draws oil from a 20 Figure 4 is a sectional view of that part of the s r oir H t r u a p p and for es the oil jacking system control device that is located adthrough a discharge tine H2 n o a i ontal jacent to a pump comprised in the system; P p line H3 and flexible tubes D Figure 5 isa sectional view of the said pump of hydraulically op d Ja s H6 p manently on the line 55 ofFigure 6; attached to the rear axle and to a pair of hy- 25 Figure 6 is a sectional view of the pump and d l y op at d l c s H" p rma e y atpart of the control devices on the line 6-6 of taehed t0 the front axle- The p p es Figure 5; a casting or body F and a cap F held on to the Figure '7 is a view similar to Figure 2 but illus-- y y bolts F m of whi h olt al o Serve tratlng a modified arrangement; for attaching the pump to the dynamo or other 30 Figure 8 is a view similar to Figure 4 but illuspp p Mounted about Centrally in trating a modified arrangement adapted for use the p y F1 is a pu p e F that with the arrangement shown in Figure 7; and c r s a o o The an F as an annular Figure 9 is a view similar to Figures 9. d 7 recess therein located eccentrically with respect 3.; but illustrating a further modification. to the axis of the spindle F. The annular pis The required warning to the driver is given by tons comprise three piston blocks f o ated in means of an electric light bulb A arranged on said ss a r y n r ers i that are enthe dashboard or in some other convenientposie s in the radial Slots f s r n ment is tlon. The lamp A is arranged in an electric cirsimilar to that described in the specification of cult Bwhich includes the vehicle batteries B Patent W the p e s and the usual engine ignition switch B Th r tat d he pist bl cks f r tat and mov circuit is thus made or broken by the engine part and together alternately and d w 011 to switch B and also by a make and break device t e spa es b e e m h inlet pescomprising a contact screw D and a two-armed Sage F8 and expel this Oil t0 the Outlet p s F9 lever B, one arm of which is adapted to contact in the p p y In e p p y are W 45 with the screw D by pressure of a spring I) actconduits J, J co d esp c b a a ety ing on the other arm, which other arm can be va 1' d a release va v i- The va v :iisee moved positively to break the circuit by connec- Figure 4) is connected to a tube J to which the tion to the means which the driver actuates for cable E is attached. The tube J carries two extending or collapsing the jacks. balls 4 which engage an arm J of a yoke M. 50

In the arrangement shown in Figures 1 and 2 The yoke J operates a clutch liiiembenJ which the drlver fits a detachable key E in a socket E is splined on to the spindle F The spindle F mounted on the dashboard E" and rotates the rotatably carries a co-operating clutch member socket. This socket is rotatably mounted by a J which is secured to the magneto drive or other ball bearing in an outer barrel E which is condriver; element Thus operation of the cable E in one direction will close the valve 1 and at the same time eng the clutch members J, J. so that the pump is driven and all of the Jacks are extended'and at the same time the circuit B is 5 completed through the contacts D, D, and the lamp A will give the required warning to the driver. The circuit B will be broken either by' turning the engineswitch oil or by rotating the key sumciently in the opposite direction to uncouple the pump from the driving member. If,

for instance, the Jacks are extended 'and the vehicle is left overnight the engine switch will be oi! and the lamp therefore will not be using the vehicle batteries, but when the engine switch 15 is turned on in the morning the lamp circuit will be completed and will warn the driver that the jacks are extended.

Instead oi employing a push and pull cable E the tube E may contain a column of fluid 20 and the arrangement shown in Figures 7 and 8 may then be employed. Referring to Figure 7, the movable member E is in the form of a piston having a rubber washer e attached to it. The key E in this arrangement has a screw.-

25 threaded connection with the barrel E so that as the key is rotated it moves axially along the,

barrel and pushes the piston E which in turn pushes the column of liquid in the tube E. This column of fluid acts upon a second-piston E 30 (Figure 8) which is connected to the tube J and valve 1 springs E, E being provided for returning the column of liquid and parts referred to to their normal positions when the key E is retracted. For making and breaking the 35 circuit B the piston E" carries a'terminal K adapted'to move into and out of engagement with the terminal B. The terminal K serves as ,a limiting stop forthe piston E and the housing is spring mounted so that the terminal K 40, continues to move to the right (Figure 7) after it meets the'terminal D, and so that on the return movement the housing is brought to rest and mi terminal K then moves further to break the electric circuit. Allowance should of course 45 be made in the spacing of the clutch members or otherwise for expansion of thecolumn of fluid, In the modification shown in Figure 9 the piston E has a recess; M therein which is engaged by the two-armed lever D and the piston E 60 has a screw-threaded engagement with the socket E which is-rotatable inthe barrel E Ifthe controlled devices are arranged adjacent to the pump instead of connected with the dashboard thecircuit B may extend to the dashboard. 55 What I claim and desire to'secure by Letters Patent of the United States is:

1. In a hydraulic jacking system for a motor vehicle and in'combination, hydraulic Jacks secured beneath the vehicle, a reservoir for con- 60 taining a liquid for operating said jacks, a pump operable to draw liquid from said reservoir and to deliver the same to said Jacks under pressure I to actuate said Jacks, a valve variously operable when said pump is at rest to prevent the 65 return of liquid delivered by the pump and to by-pass the delivered liquid back into the reservoir to release said jacks, a clutch operable to connect the pump to the engine drive an electrical signal for indicating when the pump is 7 clutched to the engine drive, a*circuit for said signal prepared in part by the closure of the engine ignition circuit,- and manually controlled means for operating said clutch, closing said valve, and completing said signal circuit. 75 2. In a hydraulic jacking system for a mote vehicle and in combination, hydraulic jacks carried bythe vehicle, a reservoir for containing a. liquid for operating said Jacks, a pump connected to said reservoir and saidjacksand operable to deliver liquid from the reservoir to the Jacks under pressure to operate said Jacks, a by-pass interconnecting said reservoirand said jacks, a safety valve normally closing said by-pass, said safety valve being automatically opened 'whenthe delivered fluid exceeds a predetermined pres- 10 sure, a release valve connected between said reservoir and the delivery side of the pump for bypassing liquid from said jacks back into said reservoir when said pump is at rest to release said jacks, a clutch operable to connect the pump to the engine drive to operate said pump under control of the running engine, an electrical signalling device operable under control or the engine ignition circuit to notii'y the operator when the clutch is actuated to connect the pump to the engine drive, and means operable from the dashboard for simultaneously operating said clutch to connect thepump to the engine drive, closing said release valve to cut oil by-passing of the Jack operating fluid, and completing the electrical circuit for actuating said signalling de- I vice.

3. The combination with a motor vehicle, of a hydraulic jacking system therefor comprising hydraulically operated jacks secured to the vehicle 0 axles, a source of Jack operating liquid supply,

a pump interconnecting said jacks and said supply source and operable to transfer liquid from said reservoir to said Jacks under pressure to initiate the jacking operation, a clutch operable to connect the pump to the engine drive, a valvecontrolied by-pass between the inlet and outlet sides of the pump, said valve being operable when the pump is declutched to permit the return flow of liquid from said jacks to said reservoir to release said Jacks, means manually controllable A from the vehicle dashboard to simultaneously initiate closure oi said valve and clutching oft said pump, a keycontrolled ignition circuit for;

the vehicle engine, an electrical signal operable when actuated to warn the driver, and a circuit for said signal prepared in part by the insertion of the key in the ignition circuit and completed when said manually controllable means is operated for actuating said signal. 60

4. The combination with a motor vehicle, of a wdraulic Jacking'system therefor comprising hyau lically operated jacks secured to the vehicle L axles, a source of Jack operating fluid supply, means including a pump having a valve-controlled by-pass between its inlet and outlet sides for controlling the supply of fluid to the jacks via the pump to operate said jacks and the return of the fluid to the reservoir via the by-pass when the valve is open to release said Jacks, a clutch operable to connect the pump to the engine drive, a lock controlled socket mechanism accessible to the operator, a cable interconnecting said socket mechanism. said valve and said clutch, said valve being open and said pump declutched'when said socket mechanism is locked, said-cable being operable responsive to the unlocking the socket mechanism to close said valve and to clutch said pump, a key controlled ignition circuit for the vehicle engine, an electrithe unlocking oi the socket mechanism for actuating said warning signal.

5. The combination with a motor vehicle, of a hydraulic jacking system therefor comprising hy-u trolled by-pass between its inlet and outlet sides for controlling the supply of fluid to the jacks via the pump to operate said jacks and the return of the fluid to the reservoir via the by-pass when the valve is open to release said jacks, a clutch operable to connect the pump to the engine drive, a lock controlled plunger mechanism accessible to the operator, a tubing for containing a column of fluid extending from said plunger mechanism to said valve and to said clutch operating controls, said valve being open and said pump declutched when the plunger mechanism is locked, said plunger being operable when unlocked to move said column of fluid in said tubing to cause said valve to be closed and said clutch to be operated to connect said pump to said engine drive, a key controlled ignition circuit for the vehicle engine, an electrically operated warning signal; and a circuit for said signal prepared in part by the insertion of the key in the ignition circuitand completed by the unlocking of the plunger mechanism for actuating said warning signal.

6. A motor vehicle having a driven element, a pump body mounted on the vehicle, a pump spindle, pump devices driven by the spindle for delivering fluid under pressure, a reservoir for liquid, a pipe leading oil from the reservoir to the inlet side of the pump, hydraulically operated lifting jacks permanently attached to the front and rear of the vehicle for raising the wheels of the vehicle off the ground, a release valve for passing the fluid pressure supplied-to the jacks back to said reservoir, means whereby the supply of fluid to the jacks ceases when a predetermined pressure is reached, a clutch devicefcr coupling the pump spindle to said driven element and uncoupling said spindle from said element, a low pressure device such as a cable leading from the clutch to a position adjacent to the driver, means whereby the driver can actuate said low pressure device to bring about coupling and uncoupling of the clutch, means connecting the low pressure device with the release valve whereby the release valve is operated simultaneously with the clutch device, an electric circuit including an electric lamp, means for supplying electricity to said circuit, means whereby the circuit is made and broken respectively when the ignition circuit of the vehicle is made and broken, a switch in said circuit, and connections between said switch and said low pressure device for opening and closing the said switch by the movement of the said low pressure device whereby movement of the low pressure device in one direction will simultaneously close the release valve, drive the pump to extend the lifting jacks,-and supply current to said lamp.

7. A motor vehicle having a driven element, a

pump body mounted on the vehicle, a pump spln-.

dle, pump devices driven by the spindle for delivering fluid under pressure, a reservoir for liquid, a pipe leading oil from the reservoir to the inlet side or the Pump. hydraulically operated lifting jacks permanently attached to the front and rear ofthe vehicle for raising all wheels of V the vehicle of! the ground simultaneously direct from the delivery side of the pump to the Jacks, I

a release valve for passing the fluid pressure supplied to the lacks back to the said reservoir, 9.

safety valve for by-passlng fluid from the delivery side of the pump to the inlet side when the pressure exceeds the predetermined value, a clutch device for coupling the pump spindle to the said driven element and uncoupling said spindle from said element, a low pressure device leading from the clutch to a position adjacentto the, driver, means whereby the driver can actuate the said low pressure device to bring about. coupling and uncoupling of the clutch, means connecting the low pressure device with the release valve whereby the release valve is operated simultaneously with the clutch device, an electric circuit, an electric lamp in said circuit, means for supplying electricity to said circuit, means whereby the circuit is made and broken respectively when the ignition circuit of the vehicle is made and broken, a switch in said circuit, and connections between said switch and said low pressure device for opening and closing the said switch by the movement of the said low pressure device whereby movement of the low pressure device in one direction will simultaneously close the release valve, drive the pump to extend the lifting Jacks and supply current to the said lamp.

8. A motor vehicle having a driven element, a pump body mounted on the vehicle, a pump spindle, pump devices driven by the spindle for delivering fluid under pressure, a reservoir for liquid, a pipe leading oil from the reservoir to the inlet side of the pump, hydraulically operated lifting jacks permanently attached to the front and rear of the vehicle for raising all wheels of the vehicle 01! the ground simultaneously direct from the delivery side of the pump to the jacks,

- a release valve for passing the fluid pressure supplied to the jacks back to the said reservoir, means whereby the supply offluid to the jacks ceases when a predetermined pressure is reached, a clutch device for coupling the pump spindle to the said driven element and uncoupling said spindle from said element, a low pressure device leading from the clutch to a position adjacent to the driver, means whereby the driver can actuate the said low pressure device to bring about coupling and uncoupling of the clutch, means connecting the low pressure device with the release valve whereby the release valve is operated simultaneously with the clutch device, an'electric circuit, an electric lamp in said circuit, means for supplying electricity to said circuit. means whereby the circult is made and broken respectively when t e lgnition circuit of the vehicle is made and bro en, a 

